A lock may be picked or a lock may be broken after a few attempts, but what stops the players from just destroying the locked object? Especially wooden doors, but even iron doors or wooden chests, all have AC and HP according to the rules.
Four or five characters with a crowbar will eventually open any door orchest that's not magically locked. Or should the DM not allow multiple attempts to destroy an object?
I've always read about how DMs should not ask players to roll when there are no consequences to the roll. And there is no consequence unless the door can somehow remain blocked after a few failed attempts.
Best Answer
When it comes to doors and chests, it really helps to think of them in terms of real objects and interactions.
For example, My house has a front door. It's made of wood and I always lock it when I leave, so people can't get in. Next to my front door, there's a massive 2x2 meter window (AC 10, 1hp) and anyone who wants to get in my house can just chuck a brick through it and go inside.
What stops them from doing this? Certainly not the stats of the window. More likely, the fact that trashing the window alerts the entire neighbourhood, will get the police called and make it very clear to anyone observing that a crime is happening. The exact same thing would happen if they bust down the door with a crowbar. Of course, if they come up with a key, or are good with a lock pick, nobody will bat an eye and they can rob the place with impunity.
If you present your players with the obstacle of a locked door in a vacuum, nothing stops them from tearing it down and rolling probably isn't necessary. At that point, your door is just there for variety and because it makes sense, but it isn't an obstacle.
But someone probably put that door there for a reason. What happens when others notice that the door is being dismantled, that's the real obstacle. A roll is required when you want to bust the door down and get through before the guards arrive, and a lock pick is preferred when you don't want every casual onlooker to see that you're busting into some place.
Lacking caring onlookers, locked objects are mostly just a short roadblock to a determined attacker. But that's the same in reality. Either you have the tools to dismantle the object, or you don't.